Differential pressure balance valve

Abstract

The utility model provides a differential pressure balance valve, and belongs to the technical field of valves. The balance valve solves the problem that an existing balance valve is difficult to adapt to pressure difference maintenance between a water supply end in a circulating system and the balance valve. The differential pressure balance valve comprises a valve body, a diaphragm and an adjusting rod, an inner cavity of the valve body is divided into an upper cavity located above the diaphragm by the diaphragm, a separation part is arranged in the valve body, a water passing opening is formed in the separation part, and a sealing ring enabling the outer side of the adjusting rod and the inner wall of the valve body to be sealed is arranged between the outer side of the adjusting rod and the inner wall of the valve body. The inner cavity of the valve body is divided into a lower cavity located below the diaphragm by the sealing ring and the diaphragm, a balance hole communicated with the water passing opening and the lower cavity all the time is formed in the lower end of the adjusting rod, and a through hole communicated with the upper cavity to the outer side of the valve body is formed in the side portion of the valve body in a penetrating mode. The pressure difference balance valve can adapt to pressure difference maintenance between a water supply end and a balance valve in a circulating system.

Description

TECHNICAL FIELD

[0001] The utility model belongs to valve technical field relates to a pressure difference balance valve. BACKGROUND

[0002] In the pipeline conveying system, hydraulic imbalance is a common problem. In reality to solve the unreasonable loop flow, usually adopt the method of improving the water pump lift, but this method will further make the energy distribution uneven, causing greater waste; Even in the terminal setting self-control type valve, it is also difficult to solve the phenomenon of hydraulic imbalance.

[0003] Balancing valve is a kind of valve that can alleviate the phenomenon of hydraulic imbalance, which is installed between the corresponding pipeline or container to adjust the relative balance of the pressure on both sides, or achieve the balance of flow through the shunt method, which is called balancing valve.

[0004] However, the existing balancing valve is more used to balance the water inlet end pressure and the water outlet end pressure, and it is difficult to adapt to the pressure difference maintenance between the water supply end in the whole circulating system and the balancing valve. INVENTION CONTENTS

[0005] The utility model discloses a kind of pressure difference balancing valves, solve the problem that existing balancing valve is difficult to adapt to the pressure difference maintenance between the water supply end in the whole circulating system and the balancing valve, to solve the above problems existing in prior art.

[0006] The utility model discloses a kind of pressure difference balancing valves, solve the problem that existing balancing valve is difficult to adapt to the pressure difference maintenance between the water supply end in the whole circulating system and the balancing valve, to solve the above problems existing in prior art.

[0007] Pressure difference balancing valve, including the valve body with water inlet and water outlet, the annular diaphragm vertically arranged in the valve body and the adjusting rod vertically arranged in the valve body, the diaphragm is sleeved on the outside of adjusting rod, the inner edge of diaphragm is fixed with adjusting rod and forms seal, the outer edge of diaphragm is fixed with the valve body and forms seal, the diaphragm separates the upper cavity in the valve body cavity, the valve body has annular separation part, the separation part is the water pass-through port that is connected to the water inlet and the water outlet, the lower end of adjusting rod and the separation part form water pass-through gap, characterized in that, the water inlet is connected to the lower end of the water pass-through port, the outer side of adjusting rod and the inner wall of valve body are provided with annular sealing ring that forms seal between the two and sealing ring is located below the diaphragm, the sealing ring and diaphragm separate the lower cavity in the valve body cavity below the diaphragm, the lower end of adjusting rod is provided with balance hole that is always connected to the water pass-through port and lower cavity, the side of valve body is provided with through hole that is connected to the upper cavity and the outer side of valve body.

[0008] The differential pressure balance valve is installed by connecting the water inlet and the water outlet of the valve body to the pipeline, connecting the through hole of the valve body to the water supply end of the circulating system through a pipeline, and making the upper cavity above the diaphragm have the same water supply pressure as the water supply end. At the same time, the water inlet of the valve body is connected to the lower cavity through the water passing opening and the balance hole, so that the lower cavity below the diaphragm has the same water pressure as the water inlet. When the water pressure of the water supply end increases, the pressure above the diaphragm increases, the diaphragm is pressed to move downward, the adjusting rod fixed inside the diaphragm moves downward, the lower end of the adjusting rod approaches the separation part in the valve body, the water passing gap is reduced, and the fluid passing amount is reduced. Conversely, when the water pressure of the water supply end decreases, the pressure above the diaphragm decreases, the diaphragm moves upward, the adjusting rod moves upward, the water passing gap is increased, the fluid passing amount is increased, and the pressure difference between the water supply end and the balance valve in the circulating system is maintained.

[0009] In the differential pressure balance valve, the outer side of the upper end of the adjusting rod is connected with a ring-shaped blocking piece, the side wall of the valve body in the upper cavity has a protruding annular stopper, the stopper is located below the blocking piece, and the outer side of the adjusting rod is sleeved with a spring, and the two ends of the spring are respectively abutted against the upper end of the stopper and the lower end of the blocking piece. The spring is arranged to make the adjusting rod move upward under the action of the spring, so that the sum of the water inlet pressure and the spring force is balanced with the pressure of the water supply end.

[0010] In the differential pressure balance valve, the differential pressure balance valve further comprises a hand wheel and a vertically arranged cylindrical adjusting sleeve, the hand wheel is fixedly connected with the upper end of the adjusting sleeve in the circumferential direction, the lower end of the adjusting sleeve extends into the valve body and is sleeved with the outer side of the blocking piece, the blocking piece is fixedly connected with the adjusting sleeve in the circumferential direction and can move axially relative to the adjusting sleeve, and the blocking piece is threadedly connected with the outer side of the adjusting rod. The hand wheel is circumferentially rotated, the blocking piece is driven to rotate in the circumferential direction through the adjusting sleeve, the adjusting rod and the diaphragm are fixed and cannot rotate in the circumferential direction, the blocking piece is screwed along the thread connected with the adjusting rod to realize the axial movement of the blocking piece relative to the adjusting rod, so that the spring can be compressed to realize the spring force adjustment, and different use requirements can be met.

[0011] In the differential pressure balance valve, the balance hole comprises a concave hole concave upward from the lower end of the adjusting rod and a side hole communicating the lower cavity and the concave hole along the radial direction of the adjusting rod. The concave hole and the side hole are arranged to avoid that the water pressure of the water inlet directly impacts on the diaphragm, and to ensure the stability of the diaphragm movement.

[0012] Compared with the prior art, the differential pressure balance valve is arranged in such a manner that the upper cavity and the lower cavity separated by the diaphragm are respectively communicated to the water supply end and the water inlet of the circulating system through the through hole and the balance hole, so that the diaphragm and the adjusting rod in the valve body can automatically adjust the size of the water passing gap with the change of the water pressure of the water supply end, to adapt to the pressure difference between the water supply end and the balance valve in the circulating system, and to meet the use requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the cross-sectional structure of the pressure differential balancing valve.

[0014] In the figure, 1 is the valve body; 1a is the water inlet; 1b is the water outlet; 1c is the upper chamber; 1d is the partition; 1e is the water outlet; 1f is the lower chamber; 1g is the through hole; 1h is the retaining edge; 2 is the diaphragm; 3 is the adjusting rod; 3a is the balancing hole; 3aa is the recessed hole; 3ab is the side hole; 4 is the water gap; 5 is the sealing ring; 6 is the blocking member; 7 is the spring; 8 is the adjusting sleeve; 9 is the handwheel. DETAILED DESCRIPTION

[0015] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0016] like Figure 1 As shown, the differential pressure balancing valve comprises a valve body 1 with a water inlet 1a and a water outlet 1b on either side of the bottom, a ring-shaped sheet-like diaphragm 2 horizontally disposed within the valve body 1, and a rod-shaped adjusting rod 3 vertically disposed within the valve body 1. The diaphragm 2 is sleeved on the outside of the adjusting rod 3. The inner edge of the diaphragm 2 is fixed to and seals the adjusting rod 3, while the outer edge of the diaphragm 2 is fixed to and seals the valve body 1. The diaphragm 2 separates the inner cavity of the valve body 1 into an upper cavity 1c located above the diaphragm 2 and a lower cavity 1f located below the diaphragm 2 and adjacent to the diaphragm 2. The bottom of the valve body 1 has a ring-shaped, vertically disposed partition 1d between the water inlet 1a and the water outlet 1b. Within this partition 1d is a water outlet 1e connecting the water inlet 1a and the water outlet 1b. The water inlet 1a is connected to the lower end of the water outlet 1e, and the water outlet 1b is connected to the upper end of the water outlet 1e. The lower end of the regulating rod 3 is positioned above and directly opposite the water inlet 1e, forming a water gap 4 between the lower end of the regulating rod 3 and the upper end of the partition 1d. In this embodiment, the regulating rod 3 comprises an upper and lower section, the upper and lower sections being fixed together. An annular sealing gasket is secured to the lower end of the regulating rod 3, which abuts against the upper end of the partition 1d, forming a seal to block the water inlet 1a and the water outlet 1b.

[0017] An annular sealing ring 5 is fixed to the outer side of the regulating rod 3, located below the diaphragm 2. The outer side of the sealing ring 5 abuts against the inner wall of the valve body 1, forming a seal. The interior of the valve body 1 between the upper side of the sealing ring 5 and the lower side of the diaphragm 2 forms the aforementioned lower chamber 1f. A balancing hole 3a is defined at the lower end of the regulating rod 3, permanently connecting the water inlet 1e and the lower chamber 1f. A through hole 1g is defined through the side of the valve body 1, connecting the upper chamber 1c to the exterior of the valve body 1. In this embodiment, the balancing hole 3a comprises a recessed hole 3aa extending upward from the lower end of the regulating rod 3, and a side hole 3ab extending radially along the regulating rod 3, connecting the lower chamber 1f with the recessed hole 3aa.

[0018] The side wall of the valve body 1 in the upper cavity 1c has a protruding annular ridge 1h, the upper end of the adjusting rod 3 passes through the ridge 1h, and an annular blocking piece 6 is threadedly connected to the outer side of the upper end of the adjusting rod 3, the outer side of the adjusting rod 3 is sleeved with a spring 7, and the two ends of the spring 7 abut against the upper end of the ridge 1h and the lower end of the blocking piece 6 respectively. The pressure balance valve further comprises a hand wheel 9 located outside the valve body 1 and a vertically arranged cylindrical adjusting sleeve 8, the hand wheel 9 is fixed to the upper end of the adjusting sleeve 8, the lower end of the adjusting sleeve 8 extends into the top of the valve body 1 and is sleeved outside the blocking piece 6, the blocking piece 6 is fixed in the circumferential direction with the adjusting sleeve 8 and can move in the axial direction relative to the adjusting sleeve 8. In this embodiment, the outer shape of the cross section of the blocking piece 6 and the shape of the inner hole of the adjusting sleeve 8 are both hexagonal, and the sizes of the two are matched.

[0019] When the pressure balance valve is installed, the water inlet 1a and the water outlet 1b of the valve body 1 are connected to the pipeline, the through hole 1g of the side of the valve body 1 is connected to the water supply end of the circulating system through a pipeline, so that the upper cavity 1c above the diaphragm 2 is the same as the water supply pressure of the water supply end, at the same time, the water inlet 1a of the valve body 1 is connected to the lower cavity 1f through the water passing hole 1e and the balance hole 3a, so that the lower cavity 1f below the diaphragm 2 is the same as the water pressure at the water inlet 1a. The sum of the water pressure of the lower cavity 1f of the diaphragm 2 and the elastic force of the spring 7 is balanced with the water pressure of the upper cavity 1c.

[0020] When in use, when the water pressure of the water supply end increases, the pressure above the diaphragm 2 increases, the diaphragm 2 is pressed to move downward, the adjusting rod 3 fixed to the inner side of the diaphragm 2 moves downward, the lower end of the adjusting rod 3 approaches the separation part 1d in the valve body 1, the water passing gap 4 is reduced, and the fluid passing amount is reduced; on the contrary, when the water pressure of the water supply end decreases, the pressure above the diaphragm 2 decreases, the diaphragm 2 moves upward, the adjusting rod 3 moves upward, the water passing gap 4 is increased, and the fluid passing amount is increased, so that the pressure difference between the water supply end in the circulating system and the balance valve is maintained.

[0021] When the elastic force of the spring 7 needs to be adjusted, the hand wheel 9 is rotated in the circumferential direction, the blocking piece 6 is driven to rotate in the circumferential direction through the adjusting sleeve 8, the adjusting rod 3 and the diaphragm 2 are fixed and cannot rotate in the circumferential direction, the blocking piece 6 is screwed along the thread connected with the adjusting rod 3, the axial movement of the blocking piece 6 relative to the adjusting rod 3 is realized, so that the spring 7 can be compressed to realize the elastic force adjustment of the spring 7, and different use requirements can be met.

[0022] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art to which the present application belongs can make various modifications or supplements to the described specific embodiments or replace them with similar ways, without deviating from the spirit of the present application or exceeding the scope defined by the appended claims.

Claims

1. A pressure differential balancing valve, comprising a valve body (1) having a water inlet (1a) and a water outlet (1b), a ring-shaped diaphragm (2) horizontally arranged in the valve body (1), and a rod-shaped regulating rod (3) vertically penetrated in the valve body (1), wherein the diaphragm (2) is sleeved on the outer side of the regulating rod (3), the inner edge of the diaphragm (2) is fixed to the regulating rod (3) and forms a seal, the outer edge of the diaphragm (2) is fixed to the valve body (1) and forms a seal, the diaphragm (2) separates the inner cavity of the valve body (1) into an upper cavity (1c) located above the diaphragm (2), the valve body (1) has an annular partition (1d), the partition (1d) has a water outlet (1e) communicating with the water inlet (1a) and the water outlet (1b), a water gap (4) is formed between the lower end of the regulating rod (3) and the partition (1d), and the valve body (1) is characterized in that: The water inlet (1a) is connected to the lower end of the water outlet (1e), and an annular sealing ring (5) is provided between the outer side of the regulating rod (3) and the inner wall of the valve body (1) to form a seal therebetween, and the sealing ring (5) is located below the diaphragm (2). The sealing ring (5) and the diaphragm (2) separate the inner cavity of the valve body (1) into a lower cavity (1f) located below the diaphragm (2). The lower end of the regulating rod (3) is provided with a balancing hole (3a) that always connects the water outlet (1e) and the lower cavity (1f). A through hole (1g) is provided through the side of the valve body (1) to connect the upper cavity (1c) to the outer side of the valve body (1). The outer side of the upper end of the regulating rod (3) is connected to a ring-shaped blocking member (6), and the side wall of the valve body (1) located in the upper cavity (1c) has a protruding annular blocking member. Along (1h), the retaining edge (1h) is located below the blocking member (6), the outer side of the regulating rod (3) is provided with a spring (7) and the two ends of the spring (7) respectively abut against the upper end of the retaining edge (1h) and the lower end of the blocking member (6), the pressure differential balancing valve also includes a hand wheel (9) and a vertically arranged cylindrical regulating sleeve (8), the hand wheel (9) is circumferentially fixed to the upper end of the regulating sleeve (8), the lower end of the regulating sleeve (8) extends into the valve body (1) and is sleeved on the outer side of the blocking member (6), the blocking member (6) is circumferentially fixed to the regulating sleeve (8) and the blocking member (6) can move axially relative to the regulating sleeve (8), the outer shape of the cross section of the blocking member (6) and the inner hole shape of the regulating sleeve (8) are both hexagonal, and the blocking member (6) is threadedly connected to the outer side of the regulating rod (3).

2. The pressure differential balancing valve according to claim 1, characterized in that: The balancing hole (3a) comprises a recessed hole (3aa) recessed upward from the lower end of the adjusting rod (3) and a side hole (3ab) opened in the radial direction of the adjusting rod (3) and communicating with the lower cavity (1f) and the recessed hole (3aa).

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